US EPA

7953063 

Journal Article 

Amorphous copolyester/polyoxymethylene blends: Thermal, mechanical and morphological properties 

Lam, KL; Abu Bakar, A; Ishak, ZAM; Karger-Kocsis, J 

2004 

1 

Kautschuk Gummi Kunststoffe
ISSN: 0022-9520 

57 

11 

570-+ 

English 

WOS:000226760300002 

Amorphous copolyester/polyoxymethylene (POM) blends were produced by melt blending covering the whole composition range. As copolyester poly(ethylene glycol-co-cyclohexane-1, 4-dimethanol terephathalate) (PETG) was selected. Injection and compression molded specimens of the blends were subjected to various rheological, thermal, thermomechanical and mechanical investigations. Many properties of these incompatible PETG/POM blends followed the additivity rule as a function of composition, such as melt flow index, density, tensile and flexural stiffnesses. However, the elongation at break, energy absorbed until tensile failure, flexural strength, notched Izod impact strength and static fracture toughness, K c showed lower values than either of the neat blend components. This was traced to the poor interfacial adhesion between PETG and POM. A co-continuous morphology was ascertained by the combination of selective extraction and scanning electron microscopy (SEM) for the blends PETG/POM=60/40 and =50/50 wt%/wt%. The tensile fracture surface of the 50/50 blend exhibited a fibrillar morphology owing to the injection molding-induced distortion of the initial co- continuous phase structure. 

Amorphous copolyester (PETG); Blend, Mechanical properties; Morphology; Polyoxymethylene (POM)